Dark styles for select component

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/components/ui/select/select.js

@@ -7,7 +7,7 @@ const Select = React.forwardRef((props, ref) => {
   return (
     <select
       ref={ref}
-      className='pl-3 pr-10 py-2 text-base border-gray-300 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 sm:text-sm rounded-md'
+      className='pl-3 pr-10 py-2 text-base border-gray-300 dark:border-gray-600 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 dark:bg-slate-800 sm:text-sm rounded-md'
       {...filteredProps}
     >
       {children}